treewide: remove nix dependency, add custom syscall wrappers & UtsName

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: Ib880f4bafe9d3bbc944af4b9125256366a6a6964

src/lib.rs

@@ -1,5 +1,45 @@
 pub mod colors;
 pub mod desktop;
 pub mod release;
+pub mod syscall;
 pub mod system;
 pub mod uptime;
+
+use std::mem::MaybeUninit;
+
+/// Wrapper for `libc::utsname` with safe accessor methods
+pub struct UtsName(libc::utsname);
+
+impl UtsName {
+  /// Calls `uname` syscall and returns a `UtsName` wrapper
+  ///
+  /// # Errors
+  /// Returns an error if the uname syscall fails
+  pub fn uname() -> Result<Self, std::io::Error> {
+    let mut uts = MaybeUninit::uninit();
+    if unsafe { libc::uname(uts.as_mut_ptr()) } != 0 {
+      return Err(std::io::Error::last_os_error());
+    }
+    Ok(Self(unsafe { uts.assume_init() }))
+  }
+
+  #[must_use]
+  pub const fn nodename(&self) -> &std::ffi::CStr {
+    unsafe { std::ffi::CStr::from_ptr(self.0.nodename.as_ptr()) }
+  }
+
+  #[must_use]
+  pub const fn sysname(&self) -> &std::ffi::CStr {
+    unsafe { std::ffi::CStr::from_ptr(self.0.sysname.as_ptr()) }
+  }
+
+  #[must_use]
+  pub const fn release(&self) -> &std::ffi::CStr {
+    unsafe { std::ffi::CStr::from_ptr(self.0.release.as_ptr()) }
+  }
+
+  #[must_use]
+  pub const fn machine(&self) -> &std::ffi::CStr {
+    unsafe { std::ffi::CStr::from_ptr(self.0.machine.as_ptr()) }
+  }
+}